simpson



(No Model.)

J. H. SIMPSON.

DIE FOR THE MANUFACTURE OF DRAW BARS.

No. 386,726. Patented July 24, 1888.

LLL 4 N PETERS, Pmw-mbn n hor. wa-hingm. D. Q

' specification, in which EINITED STATES PATENT @FFICE.

JAMES H. SIMPSON, OF PLTTSBURG, PENNSYLVANIA, ASSIGNOR TO CARNEGIE, PHIPPS & (30., (LIMITEDJ OF SAME PLACE.

DlE FOR THE MANUFACTURE OF DRAW-BARS.

SPECIFICATION forming part of Letters Patent No. 386,726, dated July 24, 1888.

l0 aZZ whom it may concern:

Be itknown that 1, JAMES H. SIMPsoN, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Dies for the l\Ianu factu re of DrawBars; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, forming part of this Figure l is a vertical crosssectional view of my improved dies on the line a" a: of Fig. 2. Fig. 2 is a side view. Fig. 3is a plan view of the bed-die and mandrel. Fig. 4 isa perspective View of the mandrel. Fig. 5 is a perspective view of one of the finished draw-bars.

Like symbols of reference indicate like parts in each.

The draw-bar which it is the object of my invention to make is one of the form shown in Fig. 5, in which 2 represents the side bars or straps; 3, the connecting end piece, and et the head or ring. The side bars have shoulders or enlargements Z) on their opposing faces; and it is the object of my invention to provide for the proper support of these shoulders or enlargements during the operation of welding the head to the side bars.

Referring to the figures on Sheet 1 of the drawings, 5 is the bed-die and 6 is the moving die which is fixed to the end of the reciprocating plunger, drop, or hydraulic press. The surface of the bed-die is shaped to correspond with the under side of the finished draw-bar head, and in the center is a vertical hole, 7, in which the shank of the draw-bar fits.

S 8 are the lugs or stops on the top of the die-block at the side, arranged to limit the motion of the moving die. The moving die or plunger 6 has a central tongue, 9, which is adapted to enter through the ring 4 into the space between the side bars, 2, as shown in Fig. 1. The face of the moving die is made to conform to the shape of the head of the drawbar.

There is a cavity made in the die-block extendingfrom the side through the block to the central hole, 7, and in this cavity is adapted to be placed a removable piece or mandrel, 10, which is made of proper size and shape to fill up the cavity of the die-block and to afford a support on the upper side for the projecting flange of the draw-bar head. At the forward end of the mandrel 10 it fits between the straps of the draw-bar, and has its bearings and support in a cavity on the other side of the hole 7. This last-named cavity also extends entirely through the die-block to the outside. so as to afford room through which a pin, 11, can be inserted for the purpose of ejecting the mandrel. As shown in Fig. 1, this mandrel, in fitting between the straps of the draw-bar, supports the inwardly-projecting shoulders I) at the upper ends of the latter, and thus pre vents distortion or displacement of these shoulders and insures perfect uniformity in their positions on the ditfercnt draw-bars pro duced by the dies. To hold the mandrel firmly in position, it is dovetailed at the bottom and fits within a correspondingly-mortised slideway in the bottom of its cavity in the die-block.

The operation of the dies is as follows: The shank and head of the drawbar, which have been first preferably united as a preliminary step in the manner described in my Patent No. 369,264., dated August 30, 1887, are heated to a welding heat and are placed in the bed-die, the shank of the draw-bar fitting in the verti cal cavity 7 of the bed-die, as shown in Figs. 1 and 2. The mandrel 10 is then inserted through the beddie, as shown in Figs. 2 and 3, so that its tongue shall fit between the straps of the draw-bar shank, being supported in the cavity on the other side of the shank, and that the upper part of the mandrel shall fit under that part of the head of the draw-bar which is left unsupported by the cavity in the dieblock. The moving die 6 is then caused to reciprocate and to strike upon the head of the drawbar, thus welding it firmly to the straps and giving the proper curvature and shape to the head. The mandrel during this operation fits underand supports the shoulders on the opposing faces of the straps of the draw-bar shank, thus preventing them from being distorted or displaced. All this is clearly shown in Figs. 1 and 2 of the drawings. When the welding operation is completed, the moving die 6 is retracted, a wedge is inserted through a hole, 12, under the bottom of the draw-bar shank, and by driving in this wedge the shank is raised within the die-block, so as to lift the head of the draw-bar above the top of the mandrel and to clear the mandrel so that the mandrel may be drawn out to release the draw-bar. The pin 11 is then inserted into the end of the mandrel-cavity and is driven in by ahammer, so that it shall strike the end of the mandrel and shall drive the latter back out of the die-block. The mandrel having been removed from between the straps of the draw-bar shank, the draw-bar can easily be removed from the die.

From this description it will be seen that the whole operation of the dies is such that the draw-bars are made rapidly and with a minimum of manual labor and with great uniformity in the product of the dies.

I do not claim herein, broadly, the use of a mandrel for supporting shoulders on the inner faces of the draw-bar shanks, since I have made that the subject-matter of a prior application, filed by me on March 12, 1888, Serial No. 266,935. In the present application I claim, specifically, the construction of the mandrel which I have described,and also claim the die having part of its working-face removable.

I claim- 1. An improvement in dies for forging drawbars, which consists in a bed-die of proper surface form to shape the face-plate of the bar, having a cavity for reception of the draw-bar shank, said die having a removable section comprising a part of the face-plate shapingsurface, substantially as and for the purposes described.

2. An improvementin-dies for forging drawbars, which consists in a bed'die of proper surface form, a cavity for reception of the draw-bar shank, and a lateral cavity, and a removable mandrel which is inserted in said lateral cavity, a part of the surface of the die being made integral with the mandrel, substantially as and for the purposes described.

In testimony whereof I have hereunto set my hand this 17th day of May, A. D. 1888.

, JAMES H. SIMPSON.

Witnesses:

W. B. CORWIN, T. W. BAKEWELL. 

